New 8 HP pistons

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Alastair Gregg
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Posts: 757
Joined: Sun Aug 27, 2006 10:43 pm
Your interest in the forum: E2 SA 922 HKY 770
D7 CB 6079 CVG 166
E2 PD 22113 MVU 377
Given Name: Alastair
Location: Corrie, Isle of Arran.

New 8 HP pistons

Post by Alastair Gregg »

Ladies and Gents I have no connection with the vendor but some unused pistons for a 1937/38 8 Hp have appeared on Ebay

http://cgi.ebay.co.uk/Jowett-7G-8G-946c ... dZViewItem

The above link should take you there.
Compliments of the Season,

Alastair Gregg
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Tony Fearn
Posts: 1743
Joined: Thu Feb 09, 2006 5:33 pm
Your interest in the forum: Early pre-wars. Owner of 1933 'Flying Fox' 'Sarah Jane, and 1934 Short saloon 'Mary Ellen'.
Given Name: Anthony
Location: Clayton le Moors, Lancashire, the Premier County in the British Isles!!

Post by Tony Fearn »

Hi Alastair,

I've had a look at these on eBay.

If my memory serves me correctly, Roy Braddock told me that standard 8hp pistons were equivalent to 60 thou oversize 7hp pistons.

Perhaps George or someone else as knowledgeable will corroborate this observation.

Regards,

Tony.
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george garside
Posts: 673
Joined: Sun Feb 12, 2006 9:47 pm
Location: formby , merseyside

Post by george garside »

Tony - yes , so may be of use to somebody, however the official JCL max overbore is 40 thou . I once had a 60 thou oversize pot blow asunder so to speak on the non watercooled part about an inch up from the flange . It carried on running & I was able to travel slowly abut 2 miles home firing on both pots & with the conrod visibly moving in the inch or so gap in the pot and with the gear leaver moving from side to side. Back on road in well under an hour with brand new pot & piston I happened to have! - So perhaps caution is called for if thinking of 60 thou oversize.

7 hp standard size 2.970
8hp 3.030
difference .062

george
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